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We propose a low-threshold soliton fiber laser passively mode locked with two different types of film-like saturable absorbers, one of which is fabricated by mixing Bi_2Te_3 with de-ionized water, as well as polyvinyl alcohol(PVA), and then evaporating them in a Petri dish, and the other of which is prepared by directly dropping Bi_2Te_3 solution on the PVA film. Both Bi_2Te_3–PVA films exhibit outstanding features of low loss, high flexibility, and easy synthesis. By incorporating Bi_2Te_3–PVA films into fiber lasers, stable single-soliton emissions are obtained at a low pump power of 13 mW. Our results suggest that the Bi_2Te_3 can work as a promising mode locker for ultrafast lasers,while PVA is an excellent host for fabricating high-performance film-based saturable absorbers.
We propose a low-threshold soliton fiber laser passively mode locked with two different types of film-like saturable absorbers, one of which is fabricated by mixing Bi_2Te_3 with de-ionized water, as well as polyvinyl alcohol (PVA), and then evaporating them in a Petri dish, and the other of which is prepared by directly dropping Bi_2Te_3 solution on the PVA film. Both Bi_2Te_3-PVA films exhibit outstanding features of low loss, high flexibility, and easy synthesis. By incorporating Bi_2Te_3-PVA films into fiber lasers , stable single-soliton emissions are obtained at a low pump power of 13 mW. Our results suggest that the Bi_2Te_3 can work as a promising mode locker for ultrafast lasers, while PVA is an excellent host for fabricating high-performance film-based saturable absorbers .